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Second-order structural identification procedure via state-space-based system identification

Journal Article · · AIAA Journal
DOI:https://doi.org/10.2514/3.11997· OSTI ID:1257799
 [1];  [1]
  1. Univ. of Colorado, Boulder, CO (United States)
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We present a theory for transforming the system-theory-based realization models into the corresponding physical coordinate-based structural models. The theory has been implemented into computational procedure and applied to several example problems. Our results show that the present transformation theory yields an objective model basis possessing a unique set of structural parameters from an infinite set of equivalent system realization models. For proportionally damped systems, the transformation directly and systematicaly yields the normal modes and modal damping. Moreover, when nonproportional damping is present, the relative magnitude and phase of the damped mode shapes are separately characterized, and a corrective transformation is then employed to capture the undamped normal modes and nondiagonal modal damping matrix.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
DOE Contract Number:
AC04-94AL85000
OSTI ID:
1257799
Report Number(s):
SAND2016--3338J; 638075
Journal Information:
AIAA Journal, Journal Name: AIAA Journal Journal Issue: 2 Vol. 32; ISSN 0001-1452
Publisher:
AIAA
Country of Publication:
United States
Language:
English

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Evaluation of spacecraft modal test methods journal January 1987
Computational Aspects of Time Integration Procedures in Structural Dynamics—Part 1: Implementation journal September 1978
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